EP0752231B1 - Geschirrspülmaschine mit Filtereinrichtung und -verfahren - Google Patents

Geschirrspülmaschine mit Filtereinrichtung und -verfahren Download PDF

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Publication number
EP0752231B1
EP0752231B1 EP96110732A EP96110732A EP0752231B1 EP 0752231 B1 EP0752231 B1 EP 0752231B1 EP 96110732 A EP96110732 A EP 96110732A EP 96110732 A EP96110732 A EP 96110732A EP 0752231 B1 EP0752231 B1 EP 0752231B1
Authority
EP
European Patent Office
Prior art keywords
filter
trap
fluid
filtering element
dishwashing machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96110732A
Other languages
English (en)
French (fr)
Other versions
EP0752231A1 (de
Inventor
Giuseppe Marchitto
Fabio Roncati
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Whirlpool EMEA SpA
Original Assignee
Merloni Elettrodomestici SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Merloni Elettrodomestici SpA filed Critical Merloni Elettrodomestici SpA
Publication of EP0752231A1 publication Critical patent/EP0752231A1/de
Application granted granted Critical
Publication of EP0752231B1 publication Critical patent/EP0752231B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4202—Water filter means or strainers
    • A47L15/4208—Arrangements to prevent clogging of the filters, e.g. self-cleaning
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4202—Water filter means or strainers
    • A47L15/4206—Tubular filters

Definitions

  • This invention refers to a dishwashing machine of the type described in the preamble of Claim 1, and a method for filtering the wash fluid recirculated in a dishwasher as described in the preamble of claim 10.
  • a preset quantity of water is input into the wash tub and said quantity of water is used for the whole wash cycle of the operative programme selected by the user.
  • the wash fluid is forced through the above recirculation pump to some spraying elements located inside the tub, which are used to spray the fluid on the crockery. Once the crockery has been sprayed, the fluid flows back to the tub bottom and is collected into said trap to be recirculated again through said pump. At the end of the wash cycle the recirculation pump stops and the above discharge pump starts operating to discharge the fluid used during the previous step from the tub to a connecting duct of the sewer system or similar.
  • dishwashing machines need a filtering system for the fluid input in the recirculation circuit, to prevent that significant soil particles removed from the crockery may be recirculated again and reduce washing performance or obstruct the recirculating pump.
  • filtering means shall be provided to prevent that significant soil particles removed from the crockery or any foreign matter, such as a tooth-picks, may block the discharge pump.
  • the fluid trap To this purpose it is known for the fluid trap to have a filtering system provided with one or more filters of different size and mesh to obtain the desired purpose of filtering the fluid, which should first be recirculated and then discharged from the machine.
  • Such an application describes a filtering system comprising a plurality of filters secured in line with the trap, in particular :
  • a first problem is that due partially to the trap configuration and partially to the recirculating pump action the direction of the fluid filtered by the microfilter always flows the same direction, i.e. it is practically always one same part of the microfilter that works on the fluid flow sucked by the recirculation pump.
  • a dishwashing machine comprising a filter having a shaft which is connected to a dedicated motor, for producing the rotation of the filter; in an alternative embodiment, the shaft of the filter is connected, through suitable transmission means, to a pump, so as to exploit the action of the latter for determining the rotation of the filter. In any event, therefore, a motor has to be used for producing the rotation of the filter.
  • a work cycle of a dishwashing machine which comprises a number of washing of rinsing actions, during which the washing fluid is conveyed in one direction through a fine-mesh filter, for filtration, and at least one working stroke for cleaning the filter wall by means of a water jet; said water jet, after the discharge of the washing liquid has occurred, is directed in counterflow at least onto the filter, which is so made to rotate; a dedicated conduit has to be provided for directing the above water jet against the rotatable filter; and an additional cycle step has to be provided for said purpose.
  • this object is obtained by a dishwashing machine having the characterizing features of the annexed claim 1, and a filtering method having the characterizing features of the annexed claim 10; preferred embodiments of the invention are then contained in the dependent claims 2-9 and 11-14.
  • reference number I indicates the stainless steel bottom of the wash tub of the dishwasher according to the present invention.
  • the bottom 1 goes further downwards in its central area where a fluid trap 2 is secured to the bottom as normally known.
  • the lower side of the trap 2 houses the suction pipe 3 of a discharge pump, whereas on the side of the trap 2 is located the suction pipe 4 of a recirculation pump.
  • the trap is covered on its upper part by a fine filter 5 substantially shaped like a funnel with a large opening radius. Said fine filter 5 goes further downwards with its median area inside the trap with a coupling side 6. Said coupling side 6 extends in the illustrated case down to the suction pipe inlet 3 of the discharge pump.
  • the coupling side 6 of fine filter 5 is surrounded by a tubular filter with a very fine mesh indicated with 7, said filter with very fine mesh 7, or microfilter, whose section is larger with respect to the coupling side 6 and is therefore at a certain distance from it.
  • microfilter 7 extends from the top downwards, i.e. from the funnel filter top 5 down to the inlet of suction pipe 3 of the discharge filter.
  • the microfilter 7 forms a cylindric surface enclosing the coupling side 6 of funnel-shaped fine filter 5.
  • a large mesh tumbler filter 8 with a handle 8A is inserted from the top in a removable way in the coupling side 6 of the funnel filter 5.
  • the microfilter 7 is not a fixed one as it is usual according to the known state of the art, but is removable under the effect of a fluid flow through the trap 2. This is obtained by two conditions.
  • microfilter 7 has some protusions, such as protuding blades, indicated by reference number 9 in the figures 2 and 3.
  • the microfilter 7 is coupled on its upper side according to a known technology to funnel filter 5 in a rotary manner. This can be obtained for instance through a round projection on the lower side of filter 5 and a corresponding seat being slightly larger than the projection on the upper end of microfilter 7.
  • the dishwashing machine operates as follows.
  • the fluid When the recirculating pump is in operation, the fluid is sucked towards the duct 4 in the direction shown by the arrows of Fig. 1. Most part of said fluid follows the path shown by arrow 10, i.e. through the funnel fine filter 5, which retains the large and fine soil particles from the washing fluid; then said soil particles will go to the coupling side 6 of the filter 5.
  • the tiniest soil particles settle in the suction pipe 3 of the discharge pump whereas the larger ones (eg. a tiny bone) that could cause the discharge pump to be jammed, are retained by the large mesh filter 8.
  • the trap 2 can be favourably configurated to cause a sort of internal vortex so that at least a part of the fluid flow sucted towards the suction duct 4 can surely strike the blades 9 and cause the microfilter 7 to rotate.
  • This concept is illustrated by the schematic section of Fig. 4 using the same reference numbers of Figs. 1 and 2.
  • the suction duct 4 can be arranged in a nearly tangential position against the main body of trap 2 to obtain the required result. From said figure it can also be noticed how the protusions 9 can favourably be either curved or inclined similar to the blades of a turbine.
  • said rotary motion has the significant result that according to the present invention and in respect to the known state of the art a different section of the microfilter 7 will always appear on the suction branch 4 of the recirculation pump 7 to ensure a higher performance of the dishwasher filtering system.
  • Another significant result according to the present invention is also the fact that the rotary action of the microfilter 7 favours the removal of soil particles from the surface of the microfilter itself to further improve the system performance, thus acquiring self-cleaning characteristics.
  • the system performance is further improved by the fact that the rotation of microfilter 7 also causes an eddy effect of the washing fluid in the substantially central area of the filtering system.
  • the fluid portion following the path shown by the arrows 12 causes the tiny soil particles eventually retained on the cylindrical inside wall of microfilter 7 to come off.
  • the small soil particles inside the coupling section 6 of filter 5 are removed partially by the flow 12 and partially by the flow 13.
  • another portion of the fluid flows centrally according to the arrow 14 to remove the fine particles retained on the upper side of the funnel filter 5 to the suction duct 2 of the discharge pump, through the porous filter bottom 8.
  • a dishwashing machine with a filter whose motion is obtained by exploiting at least a part of the fluid flow recirculated and/or discharged from the machine.
  • said filter has a substantially cylindrical configuration and surrounds at a certain distance at least a second filter whose section is also substantially circular or coupling-shaped.
  • the mobility of the mentioned filter allows improvement of the overall efficiency of the filtering system, since different parts of the filter are continuously exposed to the flow to be filtered and its motion favours the detachment of soil particles, so that the filter according to the invention acquires selfcleaning characteristics.
  • microfilter 7 can be coupled directly to the trap 2 instead of the funnel filter 5, provided that the coupling system selected shall be such to allow an angular or rotary motion of the microfilter 7.
  • the lower side of filter 7 can have a slightly truncated shape and lie in a corresponding flared seat obtained on the duct inlet 3.

Landscapes

  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Filtering Materials (AREA)
  • Details Of Reciprocating Pumps (AREA)

Claims (14)

  1. Geschirrspülmaschine, enthaltend einen Waschbottich (1) mit einem Waschfluid-Sammelbereich (2), der am Boden des Waschbottichs (1) angebracht ist und der zumindest eine Verbindungsleitung (3, 4) zu einer Pumpe besitzt, um das Waschfluid in den Kreislauf zurückzuführen oder auszutragen, wobei der Sammelbereich (2) mit Filtermitteln (5, 8) für das in den Kreislauf zurückzuführende oder auszutragende Fluid aufweist und wobei die Filtermittel (5,8) zumindest ein erstes Filterelement (7) enthalten, welches drehbar in dem Sammelbereich (2) angebracht ist,
    dadurch gekennzeichnet, dass das erste Filterelement (7) so gestaltet ist, dass es die Kraft von zumindest einem Teil der Fluidströmung (10, 11), welche durch die Pumpe in die Verbindungsleitung (3, 4) angesaugt wird, ausnutzt, so dass die Drehung des ersten Filterelements (7) durch diese Kraft bewirkt wird.
  2. Geschirrspülmaschine nach Anspruch 1,
    dadurch gekennzeichnet, dass das erste Filterelement (7) einen im Wesentlichen kreisförmigen Querschnitt aufweist.
  3. Geschirrspülmaschine nach Anspruch 1,
    dadurch gekennzeichnet, dass Vorsprünge (9) an der außenliegenden Oberfläche des ersten Filterelements (7) vorgesehen sind, wobei die Vorsprünge (9) insbesondere entweder gebogen oder geneigt sind.
  4. Geschirrspülmaschine nach Anspruch 1,
    dadurch gekennzeichnet, dass der Sammelbereich (2) so ausgebildet ist, dass er die Bildung eines Fluidwirbels während des Betriebes der Pumpe unterstützt.
  5. Geschirrspülmaschine nach Anspruch 1,
    dadurch gekennzeichnet, dass das erste Filterelement (7) zumindest ein zweites Filterelement (6) umgibt.
  6. Geschirrspülmaschine nach dem vorstehenden Anspruch,
    dadurch gekennzeichnet, dass das erste Filterelement (7) einen engeren Gitterabstand im Vergleich zu dem zweiten Filterelement (6) aufweist.
  7. Geschirrspülmaschine nach Anspruch 1,
    dadurch gekennzeichnet, dass das erste Filterelement (7) mit seinem oberen Abschnitt mit einem weiteren Filterelement (5) verbunden ist, welches innerhalb des Sammelbereichs (2) aufgenommen ist.
  8. Geschirrspülmaschine nach Anspruch 1,
    dadurch gekennzeichnet, dass das erste Filterelement (7) mit seinem unteren Abschnitt mit dem Sammelbereich (2) verbunden ist, wobei der untere Abschnitt des ersten Filterelements (7) eine im Wesentlichen kegelstumpfförmige Ausgestaltung aufweist, die mit einem entsprechenden Sitz, der in dem Sammelbereich (2) vorgesehen ist, verbindbar ist, wobei der Sitz mit dem Einlass einer Auslassleitung (3) fluchtet.
  9. Geschirrspülmaschine nach Anspruch 1,
    dadurch gekennzeichnet, dass das Filtermittel enthält:
    einen ersten Filter (5) mit großem Durchmesser der im Wesentlichen trichterförmig ausgebildet ist und den oberen Abschnitt des Sammelbereichs (2) überdeckt,
    einen zweiten Filter (6), der im Wesentlichen wie eine Kupplung (6) ausgebildet ist, die sich zwischen dem ersten Filter (5) und einem Saugrohr (3) einer Austragspumpe erstreckt, wobei das Saugrohr (3) in dem unteren Abschnitt des Sammelbereichs (2) vorgesehen ist,
    einen dritten Filter (8), der mit Wesentlichen in Form einer Trommel ausgebildet ist und der in dem zweiten Filter (6) herausnehmbar eingesetzl ist,
    wobei das erste Filterelement (7) das zweite Filterelement (6) umgibt und sich der Höhe nach im Wesentlichen zwischen dem ersten Filter (5) und dem unteren Abschnitt des Sammelbereichs (2) erstreckt.
  10. Verfahren zum Filtern der Waschflüssigkeit, welche in einer Geschirrspülmaschine in den Kreislauf zurückgeführt wird, wobei das Fluid durch einen Filter (7) gefiltert wird, der einen im Wesentlichen kreisförmigen Querschnitt aufweist, der in einem Sammelbereich (2) auf dem Boden (1) eines Waschbottichs angeordnet ist und der beweglich in dem Sammelbereich (2) gehalten ist, wobei das Verfahren den Schritt des Drehens des Filters (7) enthält,
    dadurch gekennzeichnet, dass der Filter (7) durch die Flüssigkeit gedreht wird, die eine Pumpe in ihrer Ansaugleitung (3, 4) ansaugt, wobei die Ansaugleitung die Pumpe mit dem Sammelbereich (2) verbindet.
  11. Verfahren nach Anspruch 10,
    dadurch gekennzeichnet, dass die durch die Pumpe angesaugte Flüssigkeit auf Vorsprünge (9) einwirkt, welche einstückig mit dem Filter (7) ausgebildet sind.
  12. Verfahren nach Anspruch 10,
    dadurch gekennzeichnet, dass die Drehung des Filters (7) die Zugänglichkeit eines Abschnitts des Filters (7) bestimmt, der sich kontinuierlich relativ zu der zu filternden Strömung ändert.
  13. Verfahren nach Anspruch 10,
    dadurch gekennzeichnet, dass die Drehung des Filters (7) eine Kraft hervorruft, welche das Freikommen von Schmutzkörperpartikeln von der Oberfläche des Filters (7) unterstützt.
  14. Verfahren nach Anspruch 10,
    dadurch gekennzeichnet, dass die Drehung des Filters (7) einen Wirbeleffekt auf die Waschflüssigkeit in dem Bereich des Sammelbereiches (2) hervorruft, wo der Filter (7) aufgenommen ist.
EP96110732A 1995-07-06 1996-07-03 Geschirrspülmaschine mit Filtereinrichtung und -verfahren Expired - Lifetime EP0752231B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT95TO000570A IT1276476B1 (it) 1995-07-06 1995-07-06 Macchina lavastoviglie con sistema di filtraggio perfezionato, e relativo metodo di filtraggio
ITTO950570 1995-07-06

Publications (2)

Publication Number Publication Date
EP0752231A1 EP0752231A1 (de) 1997-01-08
EP0752231B1 true EP0752231B1 (de) 2002-01-30

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EP96110732A Expired - Lifetime EP0752231B1 (de) 1995-07-06 1996-07-03 Geschirrspülmaschine mit Filtereinrichtung und -verfahren

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EP (1) EP0752231B1 (de)
DE (1) DE69618861T2 (de)
ES (1) ES2171207T3 (de)
IT (1) IT1276476B1 (de)

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CN101820808B (zh) * 2007-10-31 2012-11-28 Bsh博世和西门子家用器具有限公司 包括自清洁过滤器的载水家用电器
US10827903B2 (en) 2018-02-07 2020-11-10 Haier Us Appliance Solutions, Inc. Dishwasher appliance with a fine filter

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EP1386575B1 (de) * 2002-07-31 2005-10-05 CANDY S.p.A. Geschirrspülmaschine mit durch den Spülwasserstrom rotierbarer Filter- und Zerkleinerungsvorrichtung
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US8828148B2 (en) 2007-02-06 2014-09-09 Electrolux Home Products, Inc. Dishwasher with accessible control unit, and associated method
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US9918609B2 (en) * 2009-12-21 2018-03-20 Whirlpool Corporation Rotating drum filter for a dishwashing machine
US9119515B2 (en) 2010-12-03 2015-09-01 Whirlpool Corporation Dishwasher with unitary wash module
US9687135B2 (en) 2009-12-21 2017-06-27 Whirlpool Corporation Automatic dishwasher with pump assembly
US8627832B2 (en) 2010-12-13 2014-01-14 Whirlpool Corporation Rotating filter for a dishwashing machine
US8667974B2 (en) 2009-12-21 2014-03-11 Whirlpool Corporation Rotating filter for a dishwashing machine
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US9668636B2 (en) 2010-11-16 2017-06-06 Whirlpool Corporation Method and apparatus for dishwasher with common heating element for multiple treating chambers
US9034112B2 (en) 2010-12-03 2015-05-19 Whirlpool Corporation Dishwasher with shared heater
US9107559B2 (en) * 2011-05-16 2015-08-18 Whirlpool Corporation Dishwasher with filter assembly
US8733376B2 (en) 2011-05-16 2014-05-27 Whirlpool Corporation Dishwasher with filter assembly
US9010344B2 (en) 2011-06-20 2015-04-21 Whirlpool Corporation Rotating filter for a dishwashing machine
US9861251B2 (en) 2011-06-20 2018-01-09 Whirlpool Corporation Filter with artificial boundary for a dishwashing machine
US9265401B2 (en) * 2011-06-20 2016-02-23 Whirlpool Corporation Rotating filter for a dishwashing machine
US9005369B2 (en) 2011-06-20 2015-04-14 Whirlpool Corporation Filter assembly for a dishwasher
US20120318296A1 (en) * 2011-06-20 2012-12-20 Whirlpool Corporation Ultra micron filter for a dishwasher
US9301667B2 (en) 2012-02-27 2016-04-05 Whirlpool Corporation Soil chopping system for a dishwasher
US9730570B2 (en) * 2012-05-30 2017-08-15 Whirlpool Corporation Reduced sound with a rotating filter for a dishwasher
US9237836B2 (en) 2012-05-30 2016-01-19 Whirlpool Corporation Rotating filter for a dishwasher
US9833120B2 (en) 2012-06-01 2017-12-05 Whirlpool Corporation Heating air for drying dishes in a dishwasher using an in-line wash liquid heater
US9532700B2 (en) 2012-06-01 2017-01-03 Whirlpool Corporation Dishwasher with overflow conduit
US9451862B2 (en) 2012-06-01 2016-09-27 Whirlpool Corporation Dishwasher with unitary wash module
US9554688B2 (en) 2012-10-23 2017-01-31 Whirlpool Corporation Rotating filter for a dishwasher and methods of cleaning a rotating filter
CN105615799A (zh) * 2014-11-07 2016-06-01 林贤华 一种洗碗机
AU2016295058B2 (en) * 2015-07-21 2021-03-04 Lg Electronics Inc. Dishwasher
CN107928592B (zh) * 2017-12-13 2021-04-20 佛山市顺德区美的洗涤电器制造有限公司 水箱组件及洗涤电器
EP3876809B1 (de) * 2018-11-09 2023-07-12 Arçelik Anonim Sirketi Geschirrspüler mit einem filter
CN111743487B (zh) * 2019-03-28 2024-02-02 博西华电器（江苏）有限公司 洗碗机
DE102020106792A1 (de) 2020-03-12 2021-09-16 Illinois Tool Works Inc. Spülmaschine mit mindestens einem als rezirkulationskreislauf ausgebildeten waschsystem

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Publication number Priority date Publication date Assignee Title
CN101820808B (zh) * 2007-10-31 2012-11-28 Bsh博世和西门子家用器具有限公司 包括自清洁过滤器的载水家用电器
US10827903B2 (en) 2018-02-07 2020-11-10 Haier Us Appliance Solutions, Inc. Dishwasher appliance with a fine filter

Also Published As

Publication number Publication date
EP0752231A1 (de) 1997-01-08
DE69618861T2 (de) 2002-09-19
ITTO950570A1 (it) 1997-01-06
ITTO950570A0 (it) 1995-07-06
ES2171207T3 (es) 2002-09-01
IT1276476B1 (it) 1997-10-31
DE69618861D1 (de) 2002-03-14

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